An electrician usually uses a special tool to measure the current that flows through a wiring. The tool is called a multimeter and it is capable of measuring several properties of electric flow. In this experiment, you’ll get to build a simple type of meter that will also respond to the flow of current.Things Required:10 […]

Place your hand gently over your throat. Hum a tune. What do you feel? Can you detect any changes in the vibration as you vary the pitch and volume of the notes? Within your throat is a body part called a voice box. The voice box contains bands of muscle tissue called vocal cords. Like

Try this exciting experiment in the playground with a swing and find out if weight has any effect on the speed of the swing of a pendulum.Things Required:WatchOutside playground swingRuler2 helpersDirections:Hold the seat of the swing and move back 3 or 4 steps. Ask your helper to place the ruler on the ground in front

Can two switches control a light from two different locations? Find out in this experiment.Things Required:Two “D” cells in battery holdersOne torch bulb in lamp holderSix thumbtacksTwo metal paper clipsTwo pieces of wood or thick foam coreConnecting wires with each end stripped 1½ inches bare of insulationDirections:For this activity, you’ll need to build two new

A hanger is good to hang clothes on it. Wrong, you can also build an incredible sound-making device from a hanger? Here’s how.Things Required:Metal clothes hangerKite stringMetal spoonTwo paper clipsTwo paper cupsPair of scissorsPushpinDirections:Use a pushpin to punch a hole into the bottom of a paper cup. Cut two segments of kite string, each about

Does gravity pulls all things down at the same speed? Let’s check it out in this experiment.Things Required:PaperBook larger than the paperDirections:Hold the paper in one hand and the book in the other. Drop the book and the paper at the same time. Observe the paper and book as they fall and strike the floor.

Electricity carrying cables are often buried underground. To locate their exact position, utility workers use a tool that detects magnetic fields. Within the cables, a current of flowing charges produces a magnetic field that extends into the surrounding space. By uncovering this magnetic field, workers can locate the exact position of the unseen electric flow.Things

Imagine five empty match boxes positioned one right after the next. Push over the first match box and what happens? The first match box falls into the second. The second falls into the third. The third falls into the fourth…Imagine the tiny particles (atoms and molecules) that make up a kite string. In a similar

A parachute is an umbrella-like device for slowing the descent of a body falling through the atmosphere. Separate panels sewn together form a canopy attached by suspension lines to a harness worn by the user. Originally designed to provide a safe escape from a disabled aircraft, parachutes are also used for dropping supplies and for

Have you ever played the electrified board game in which you must operate on a patient? If your hand isn’t steady, the forceps strike the conducting metal. Instantly a loud sound confirms that you “grounded out” and completed your turn. In this experiment, you’ll have the chance to build another type of game that also

Have you ever looked closely at a saxophone, clarinet mouth-piece or shehnai? If so, you probably observed that the mouthpiece contains a thin piece of wood. This part of the instrument is called a reed. When you blow across the reed, you set it vibrating. It’s this back-and-forth movement that produces the sound. As these

Purpose to determine the effect that the centre of gravity of an object has on motion.Things Required:2 yardsticks (meter sticks)3 books, each at least 1 inch (2.5 cm) thickMasking tape2 funnels of equal sizeDirections:Put two books 30 inches (90 cm) apart on the floor. Place the remaining book on top of one of the other

In movies you must have seen that the alarm goes on the moment an intruder opens a door. In this experiment, you can make it for yourself.Things Required:Connecting wires with each end stripped 1½ inches bare of insulationSimple buzzer circuit5 inches × 3 inches cardboardPair of scissorsMetal paper clipTapeTwo metal thumbtacksStringSmall square piece of paperDirections:Cut